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Groups > comp.lang.python > #53763

Re: Multiprocessing / threading confusion

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Piet van Oostrum <piet@vanoostrum.org> writes:


>     def run(self):
>         for n in range(5):
>             self.que.put('%s tick %d' % (self._pid, n))
>             # do some work
>             time.sleep(1)
>         self.que.put('%s has exited' % self._pid)

To prevent the 'exited' message to disappear if there is an exception in
the thread you should protect it with try -- finally:

    def run(self):
        try:
            for n in range(5):
                self.que.put('%s tick %d' % (self._pid, n))
                # do some work
                time.sleep(1)
        finally:
            self.que.put('%s has exited' % self._pid)

This doesn't help for the premature termination of the thread, as that
isn't an exception. But use the w.join() for that. Or you could put the
'exited' message after the w.join() command.
-- 
Piet van Oostrum <piet@vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]

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Thread

Multiprocessing / threading confusion Paul Pittlerson <menkomigen6@gmail.com> - 2013-09-05 12:27 -0700
  Re: Multiprocessing / threading confusion "marduk@python.net" <marduk@python.net> - 2013-09-05 18:28 -0400
    Re: Multiprocessing / threading confusion Paul Pittlerson <menkomigen6@gmail.com> - 2013-09-05 16:34 -0700
      Re: Multiprocessing / threading confusion Chris Angelico <rosuav@gmail.com> - 2013-09-06 13:00 +1000
  Re: Multiprocessing / threading confusion Chris Angelico <rosuav@gmail.com> - 2013-09-06 08:46 +1000
    Re: Multiprocessing / threading confusion Paul Pittlerson <menkomigen6@gmail.com> - 2013-09-05 17:03 -0700
      Re: Multiprocessing / threading confusion Piet van Oostrum <piet@vanoostrum.org> - 2013-09-05 23:54 -0400
        Re: Multiprocessing / threading confusion Piet van Oostrum <piet@vanoostrum.org> - 2013-09-06 00:28 -0400
  Re: Multiprocessing / threading confusion Paul Pittlerson <menkomigen6@gmail.com> - 2013-09-06 11:27 -0700
    Re: Multiprocessing / threading confusion Skip Montanaro <skip@pobox.com> - 2013-09-06 13:53 -0500
    Re: Multiprocessing / threading confusion Dave Angel <davea@davea.name> - 2013-09-06 20:34 +0000
    Re: Multiprocessing / threading confusion Piet van Oostrum <piet@vanoostrum.org> - 2013-09-06 17:15 -0400

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